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(* ========================================================================= *)
(* THE ACTIVE SET OF CLAUSES *)
(* Copyright (c) 2002 Joe Leslie-Hurd, distributed under the BSD License *)
(* ========================================================================= *)
signature Active =
sig
(* ------------------------------------------------------------------------- *)
(* A type of active clause sets. *)
(* ------------------------------------------------------------------------- *)
type simplify =
{subsume : bool,
reduce : bool,
rewrite : bool}
type parameters =
{clause : Clause.parameters,
prefactor : simplify,
postfactor : simplify}
type active
(* ------------------------------------------------------------------------- *)
(* Basic operations. *)
(* ------------------------------------------------------------------------- *)
val default : parameters
val size : active -> int
val saturation : active -> Clause.clause list
(* ------------------------------------------------------------------------- *)
(* Create a new active clause set and initialize clauses. *)
(* ------------------------------------------------------------------------- *)
val new :
parameters -> {axioms : Thm.thm list, conjecture : Thm.thm list} ->
active * {axioms : Clause.clause list, conjecture : Clause.clause list}
(* ------------------------------------------------------------------------- *)
(* Add a clause into the active set and deduce all consequences. *)
(* ------------------------------------------------------------------------- *)
val add : active -> Clause.clause -> active * Clause.clause list
(* ------------------------------------------------------------------------- *)
(* Pretty printing. *)
(* ------------------------------------------------------------------------- *)
val pp : active Print.pp
end
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